Improvement in pulleys



V J. MAOKIE.

Pulley.

No. 217,128. Patented July 1, 1879.

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N.PETERS, PHOTO LTKOGRAF'HER WASHINGTON D O #inemrea:

UNITED STATES PATENT OEEIoE.

JOI IN MAOKIE, OF READING, COUNTY OF BERKS, ENGLAND.

IMPROVEMENT IN PU LLEYS.

Specification forming part of Letters Patent N o. 217, 128, dated July 1, 1879; application filed May 3, 1879; patented in England, May 10, 1877.

To all whom it may concern:

Be it known that I, J OHN MACKIE, of Readin g, in the county of Berks, England, engineer, have invented an Improved Pulley or Drum; and do hereby declare that the following description, taken in connection with the accompanying sheet of drawings, hereinafter referred to, forms a full and exact specification of the same, wherein I have set forth the nature and prlnciples of my said improvement, by which my invention may be distinguished from others of a similar class, together with r such parts as I claim and desire to secure by Letters Patent-that is to say:

This pulley is an improvement upon the ordinary split or divided pulley made in halves, and overcomes the ditficulty and loss of time occasioned in fitting pulleys upon driving shafts or spindles.

This invention consists in the construction of the periphery and arms or spokes of the pulley, as shown in Figure1, which may be made of wrought-iron, steel, or other metal, and the arms or spokes may be made of various shapes or forms. The boss or center of the pulley (marked A) is made in two pieces. Into this boss the arms or spokes (marked B) are inserted either by being cast, wrought, rivetcd, or screwed. The arms or spokes B are made either of double or single bars of wroughtiron, steel, or other metal, and are fastened into the periphery of the pulley. In the drawings these are shown of double bars. The peripheryitself is split or divided, as shown in Fig.

3, but has only one openingor division, (marked (1,) bymeans of which it is opened, and when this is done the boss A is also opened sutfi-' ciently to place the pulley upon the driving shaft or spindle D, the elasticity of the periphery at the pointE giving a sufiicient opening of the half-split or division in the same at O, and also of the boss A, to enable this to be accomplished.

Having thus described the nature of my invention, and the best means I know of carry ing it out in practice, I claim 1. A pulley or drum having a split boss and a rim or periphery split on one side only, the opposite side of the periphery being so constructed that'it will permit of thesplit side and the boss being opened out sufficiently to allow it to be passed over the shaft, substantially as herein described.

2. In a pulley or drum, the combination of the split boss A, spokes B, and rim 0, split at one point of its circumference.

In testimony whereofI have signed my name to this specificatiom iu the presence of two subscribing witnesses, this 17th day of April, 1879. J

. JOHN MAOKIE.

YVitnesses:

OLIVER IMRAY,

20 Southampton Buildings, London, W. O.

OHAs. BERKLEY HARRIS,

l7 Gracechurch Street, London, E. O. 

